Edit respective element on list

Question

I'm making 2 lists. List of boys and girls. The button creates new element for each. Soo I want when i click for example boy1 element. Edit girl1 element. And change the color to black. When i click boy 2 edit girl2 and so on.
This is my Html

<div class="mainDiv">

<input type="button" value="Add new" id="clickme"onclick="addElements()">

  <ul id="boys">

      <li id="boy1">Boy1</li>

    </ul>



    <ul id="girls">

      <li id="girl1">Girl 1</li>

  </ul>

</div>

Css

#boys {

  color:red;

}

#girls {

  color:blue;

}

li {

  cursor:pointer;

}

And JavaScript

 var i = 1;

    $("#clickme").click(function() {

      i++

        $("#boys").append("<li id='boy" + i+"'>Boy"+ i +"</li>");

            $("#girls").append("<li id='girl" + i+"'>Girl"+ i +"</li>")

  });

The example of result should look like this

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Answer 1

You need to delegate event on the parent div:

$(function () {
  var i = 1;
  $("#clickme").click(function() {
    i++
    $("#boys").append("<li id='boy" + i+"'>Boy"+ i +"</li>");
    $("#girls").append("<li id='girl" + i+"'>Girl"+ i +"</li>")
  });
  
  // attach event handler for all li elements: also for
  // the one created dynamically
  $('div.mainDiv').on('click', 'li', function(e){
    if (this.id.indexOf('boy') != -1) {
      $('#girl' + this.id.substr(3)).css("color", "black");
    } else {
      $('#boy' + this.id.substr(4)).css("color", "black");
    }
  });
});

#boys {
  color:red;
}
#girls {
  color:blue;
}
li {
  cursor:pointer;
}

<script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>

<div class="mainDiv">
    <input type="button" value="Add new" id="clickme">
    <ul id="boys">
        <li id="boy1">Boy1</li>
    </ul>

    <ul id="girls">
        <li id="girl1">Girl1</li>
    </ul>
</div>

Edit respective element on list

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